Capacitor with conductive adhesion layer
An embodiment of the capacitor includes a metal current collector, a conductive adhesion layer applied on the metal current collector, and an electrode active layer applied on the conductive adhesion layer, wherein the adhesion layer has a conductive non-carbide metal compound, particularly a metal oxide or metal nitride. An embodiment of the method of manufacturing the capacitor is also disclosed.
1. A wet electrolyte capacitor, comprising:
a cathode, the cathode comprising:
a cathode metal current collector,
a nanostructured conductive adhesion layer applied on said cathode metal current collector, and
an electrode active layer applied on said nanostructured conductive adhesion layer,
wherein said nanostructured conductive adhesion layer comprises a conductive non-carbide metal compound, said conductive non-carbide metal compound comprises a metal nitride or a metal oxide,
wherein said electrode active layer includes a binder.
2. The capacitor according to claim 1 , wherein:
said non-carbide metal compound includes a transition metal, said transition metal selected from ruthenium or iridium.
3. The capacitor according to claim 1 , further comprising:
an anode, wherein said anode:
comprises a valve metal, said valve metal including tantalum, or niobium.
4. The capacitor according to claim 1 , further comprising an aqueous electrolyte.
5. The capacitor according to claim 1 , wherein said nanostructured conductive adhesion layer comprises:
a metal oxide, said metal oxide including ruthenium oxide, iridium oxide, or a mixture thereof; and/or
said metal nitride includes titanium nitride, zirconium nitride, hafnium nitride, vanadium nitride, niobium nitride, tantalum nitride, molybdenum nitride, tungsten nitride, or a mixture thereof.
6. The capacitor according to claim 1 , wherein said nanostructured conductive adhesion layer has a thickness in the range of 1 nm to 5 μm.
7. The capacitor according to claim 1 , wherein said electrode active layer comprises a conductive material selected from carbon, said carbon selected from activated carbon, graphite, graphene, and/or carbon nanotubes.
8. The capacitor according to claim 1 , wherein the binder is selected from polyvinylidene fluoride (PVDF) polytetrafluoroethylene (PTFE), carbomethyl cellulose (CMC) or a rubber.
9. The capacitor according to claim 1 , wherein said metal current collector:
comprises titanium or a titanium alloy.
10. The capacitor according to claim 1 , further comprising a metal housing, wherein at least a part of said metal housing forms said metal current collector.
11. Method for manufacturing said capacitor according to claim 1 , comprising the steps of:
applying said nanostructured conductive adhesion layer on said metal current collector, and
applying said electrode active layer on said nanostructured conductive adhesion layer, wherein said nanostructured conductive adhesion layer comprises said non-carbide conductive metal compound,
wherein said nanostructured conductive adhesion layer is applied on said metal current collector in form of a solution or suspension, wherein said solution or said suspension comprises said non-carbide metal compound and an organic solvent, wherein after application of said nanostructured conductive adhesion layer said metal current collector is tempered at a temperature below 700° C.
12. The method according to claim 11 , wherein said electrode active layer is applied in form of a composition, including a paste, comprising a conductive material, including carbon and activated carbon, graphite, graphene, and/or carbon nanotubes, wherein after applying said electrode layer said metal current collector is tempered at a temperature below 400° C.
13. An implantable medical device, comprising said capacitor manufactured by said method according to claim 11 .
14. The method according to claim 11 , wherein said metal current collector is tempered at a temperature in the range of 360° C. to 550° C.
15. The method according to claim 11 , wherein said electrode active layer is applied in form of a composition, including a paste, comprising a conductive material, including carbon and activated carbon, graphite, graphene, and/or carbon nanotubes, wherein after applying said electrode layer said metal current collector is tempered at a temperature in the range of 80° C. to 240° C.
16. An implantable medical device, comprising said capacitor according to claim 1 .
17. The capacitor according claim 1 , wherein said nanostructured conductive adhesion layer has a thickness in the range of 40 nm to 0.4 μm.
18. The capacitor according to claim 1 , wherein the nanostructured adhesion layer comprises spherical or rod-shaped particles with a size in the range of 10 nm to 100 nm.